[xmir] multi-monitor - one monitor freezes randomly

[Gerry Boland]

MacBook Pro 8,1 - intel graphics

I'm using DisplayPort to HDMI adapter, then a HDMI->DVI cable, to plug in an external monitor.

USC seems to have turned on XMir again. On boot Greeter came up as normal, and I logged in to X. All fine.

It works, and then randomly one of the outputs freezes. It's mostly the external monitor, but the laptop screen did freeze once too. Moving mouse to the frozen screen has no effect (mouse not visible on frozen monitor)
---
ApportVersion: 2.14.7-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
DistroRelease: Ubuntu 14.10
EcryptfsInUse: Yes
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Apple Inc. Device [106b:00db]
InstallationDate: Installed on 2014-04-26 (130 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
NonfreeKernelModules: wl
Package: unity-system-compositor 0.0.5+14.10.20140829-0ubuntu1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 3.16.0-12.18-generic 3.16.1
SystemImageInfo: Error: [Errno 2] No such file or directory
Tags: utopic
Uname: Linux 3.16.0-12-generic x86_64
UpgradeStatus: Upgraded to utopic on 2014-05-23 (104 days ago)
UserGroups: adm autopilot cdrom dip lpadmin plugdev sambashare sbuild sudo
_MarkForUpload: True
version.libdrm: libdrm2 2.4.56-1
version.lightdm: lightdm 1.11.8-0ubuntu1
version.mesa: libegl1-mesa-dev 10.2.6-1ubuntu3

[Daniel van Vugt (vanvugt)]

If USC is frozen, we should be able to see which thread it is by looking at the stack traces. Can you get some stacks from the frozen server?

You might have to log in via SSH...

[Daniel van Vugt (vanvugt)]

Or even better: Send the frozen server a fatal signal. That should force it to dump core and generate a bug-report.

[Gerry Boland (gerboland)]

apport information

[Gerry Boland (gerboland)]

apport information

[Gerry Boland (gerboland)]

apport information

[Gerry Boland (gerboland)]

apport information

[Gerry Boland (gerboland)]

apport information

[Gerry Boland (gerboland)]

apport information

[Gerry Boland (gerboland)]

apport information

[Daniel van Vugt (vanvugt)]

Thanks for the stack trace. I can see two page flipping threads for different displays, although one of them is in select(). So I'm wondering are you seeing high CPU usage (one thread spinning)? If so, then which thread?

[Daniel van Vugt (vanvugt)]

XMir 1.0 (the old Xorg extension) is now deprecated and is not being maintained or fixed. It is replaced by the new 'Xmir' binary (package 'xmir') introduced in Ubuntu 15.10 wily.